HM Digital is the manufacturer of easy-to-use water testers and meters for homeowners and professional water treatment dealers alike. Known for their reliability and excellent value, HM Digital meters are great tools for measuring water quality to determine what equipment is needed, or to monitor the performance of installed equipment.

Popular products from HM Digital include the TDS-3 and TDS-4 pocket style meters for measuring reverse osmosis system performance. Equally popular are their inline TDS monitoring systems for industrial/commercial RO applications.